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OK, here is a patch (fix_readline_and_read.diff) that keeps 
the new readline behaviour when size is None and calls read 
only once (i.e. the 2.3 behaviour) otherwise. The "read() 
cleanup patch" is also included. Running dark-storm's test 
script on Windows with the patch applied confirms that it 
fixed this particular problem (of course the tokenizer should 
still be fixed). Marc-André, if there are no objections, can I 
check this in?